High temperature superconductor Na2B2H stabilized by hydrogen intercalation under ambient pressure

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外文标题：High temperature superconductor Na2B2H stabilized by hydrogen intercalation under ambient pressure

外文摘要：Hydrogenated metal borides have attracted much attention due to their potential high-temperature superconductivity.Here,we propose a new strategy for hydrogen intercalation tuning the stability and superconductivity of the boron honeycomb sublattice,and predict an unprecedented layered compound Na2B2H,which hosts excellent superconductivity.Strikingly,the super-conducting transition temperature(Tc)of Na2B2H reaches 42 K at ambient pressure.The Tc value can be further increase to 63 K under 5％biaxial tensile strain.The excellent superconductivity originates from the strong electron-phonon coupling between theσ-bonding bands near the Fermi level and the B-B stretching optical E'modes.The interstitial electron localization and crystal orbitals of the H-intercalated Na ion layer well match the boron honeycomb lattice and act as a chemical template to stabilize the B layer.Furthermore,the introduction of hydrogen tuned the Fermi level,and the coupling vibration of Na and H ions effectively enhanced the dynamic stability of the structure.Na2B2H represents a new family of layered high-temperature superconductors,and the strategy of stabilizing the honeycomb boron sublattice via chemical template hosts great potential for application to more layered compounds.

外文关键词：

superconductivityhydrogenationmetal borideselectron-phonon coupling

作者：

Wendi Zhao、Defang Duan、Zhengtao Liu、Zihao Huo、Shumin Guo、Decheng An、Maosheng Miao、Tian Cui

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作者单位：

State Key Laboratory of Superhard Materials,Key Laboratory of Material Simulation Methods&Software of Ministry of Education,College of Physics,Jilin University,Changchun 130012,China

Department of Chemistry and Biochemistry,California State University,Northridge,California 91330,USA

Department of Earth Science,University of California,Santa Barbara,California 93106,USA

Institute of High Pressure Physics,School of Physical Science and Technology,Ningbo University,Ningbo 315211,China

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关键词：

superconductivity hydrogenation metal borides electron-phonon coupling

出版年：

2024

DOI：

10.1007/s11433-024-2447-0

中国科学:物理学力学天文学(英文版)

中国科学院

中国科学:物理学力学天文学(英文版)

CSTPCD

影响因子：0.91

ISSN：1674-7348

年,卷(期)：2024.67(11)

High temperature superconductor Na2B2H stabilized by hydrogen intercalation under ambient pressure

中国科学:物理学 力学 天文学(英文版)

中国科学:物理学力学天文学(英文版)